CN210838979U - Starting circuit suitable for zero-voltage lithium battery - Google Patents
Starting circuit suitable for zero-voltage lithium battery Download PDFInfo
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- CN210838979U CN210838979U CN201921672060.2U CN201921672060U CN210838979U CN 210838979 U CN210838979 U CN 210838979U CN 201921672060 U CN201921672060 U CN 201921672060U CN 210838979 U CN210838979 U CN 210838979U
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- resistor
- control chip
- lithium battery
- triode
- electrode
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Abstract
The utility model discloses a starting circuit who is suitable for zero voltage lithium cell belongs to charger field technical field, has solved when the whole air-out of electric quantity of self lithium cell, and control chip is because unable the electric to the outside switching device of uncontrollable. Therefore, the lithium battery is difficult to charge under the condition of zero voltage, the technical scheme is characterized by comprising a charge-discharge interface, a switch control circuit, a control chip and a lithium battery pack, wherein the positive electrode of the lithium battery pack is connected with the control chip and used for providing a power supply, the control chip is connected to a power supply main line between the charge-discharge interface and the lithium battery pack through the switch control circuit, the switch control circuit controls the charge-discharge interface and the main line of the lithium battery pack to be switched on and off, the lithium battery pack is connected with a solar battery and an energy storage capacitor, the energy storage capacitor is connected with the solar battery in parallel, the energy storage capacitor is also connected to a power supply end of the control chip, and the effect that the lithium battery is automatically switched to obtain electric energy from the outside.
Description
Technical Field
The utility model relates to a charger field especially relates to a starting circuit who is suitable for zero voltage lithium cell.
Background
Due to the chemical characteristics of the lithium ion battery, the lithium ion battery performs chemical positive reaction of mutual conversion of electric energy and chemical energy inside the lithium ion battery in the normal use process. Under certain conditions, such as overcharge, overdischarge, and overcurrent to a lithium battery, the battery voltage will be zero.
Therefore, all lithium ion batteries require a protection circuit for effectively monitoring the charging and discharging states of the batteries and shutting down the charging and discharging circuits under certain conditions to prevent damage to the batteries.
At present, most lithium battery protection circuits get electricity from self lithium batteries, and when the electric quantity of self lithium batteries is completely discharged, a control chip cannot get electricity, so that an external switch device cannot be controlled. Lithium batteries are difficult to charge at zero voltage.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. In view of this, the utility model aims to provide a starting circuit who is suitable for zero voltage lithium cell can carry out automatic switch-over and acquire the electric energy from the outside and start when the lithium cell open circuit voltage is zero.
In order to solve the technical problem, the technical scheme of the utility model is that: the utility model provides a starting circuit suitable for zero voltage lithium cell, includes charge-discharge interface, on-off control circuit, control chip and lithium cell package, and the anodal connection control chip of lithium cell package is used for providing the power, and control chip passes through on-off control circuit and connects on the power supply main line between charge-discharge interface and lithium cell package, and on-off control circuit controls the break-make of charge-discharge interface and lithium cell package main line, be connected with solar cell and energy storage capacitor on the lithium cell package, energy storage capacitor and solar cell are parallelly connected, energy storage capacitor still connects the power supply end at control chip.
As a specific aspect of the present invention, it may be preferable that: the switch control circuit comprises a first driving switch part and a second driving switch part;
the first driving switch part comprises resistors R1, R2, R3, a triode Q1 and a mos tube Q2; one end of a resistor R1 is connected with the control chip, the other end of the resistor R1 is connected with the base electrode of the triode Q1, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the grid electrode of the mos tube Q2 and one end of the resistor R3, and the other end of the resistor R3 is connected with the source electrode of the mos tube Q2 and the positive electrode of the charge-discharge interface;
the second driving switch part comprises resistors R4, R5, R6, a triode Q3 and a mos tube Q4; one end of a resistor R4 is connected with the control chip, the other end of the resistor R4 is connected with the base electrode of the triode Q3, the emitter electrode of the triode Q3 is grounded, the collector electrode of the triode Q3 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with the grid electrode of the mos tube Q2 and one end of the resistor R6, and the other end of the resistor R6 is connected with the source electrode of the mos tube Q4 and the anode of the lithium battery pack;
the drain electrode of the mos tube Q2 is connected with the drain electrode of the mos tube Q4.
As a specific aspect of the present invention, it may be preferable that: the mos tube Q2 and the mos tube Q4 are P-channel enhanced mos tubes, and unidirectional diodes are combined inside the P-channel enhanced mos tubes.
As a specific aspect of the present invention, it may be preferable that: the switch control circuit is carried on the pcb, fixedly connected with thermoelectric generation piece on the pcb, the thermoelectric generation piece is parallelly connected on energy storage capacitor.
The utility model discloses technical effect mainly embodies in following aspect: the electric quantity of lithium cell package is emptyd completely, then open circuit voltage is almost zero, then because it can't give control chip power supply, so can't drive switch control circuit, thereby can't realize obtaining the electric energy from the outside and charge, also can't obtain the electric energy from the charge-discharge interface, and after the circuit of this scheme has been adopted, because the power supply in-process of lithium cell package can give energy storage capacitor storage electric energy in advance, thereby be unlikely to lose the power supply ability completely, even energy storage capacitor discharges completely, also can't provide electric power, then pass through solar cell, place the product and shine under the sunlight, then can be for energy storage capacitor power supply again and can be convenient for control chip to get electric, and can also control switch control circuit realizes charging and discharge function.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration in embodiment 1;
fig. 2 is a schematic structural diagram in embodiment 2.
Reference numerals: 1. a charge-discharge interface; 2. a switch control circuit; 21. a first drive switch section; 22. a second driving switch section; 3. a control chip; 4. a lithium battery pack; 5. a solar cell; 6. an energy storage capacitor; 7. a unidirectional diode; 8. a pcb board; 9. thermoelectric power generation piece.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention so that the technical solution of the present invention can be more easily understood and grasped, and should not be construed as limiting the present invention.
Example 1:
referring to fig. 1, a starting circuit suitable for a zero-voltage lithium battery includes a charge-discharge interface 1, a switch control circuit 2, a control chip 3, and a lithium battery pack 4. The positive pole connection control chip 3 of lithium cell package 4 is used for providing the power, and control chip 3 passes through on-off control circuit 2 and connects on the power supply main line between charge and discharge interface 1 and lithium cell package 4, and on-off control circuit 2 controls the break-make of charge and discharge interface 1 and the 4 main lines of lithium cell package, is connected with solar cell 5 and energy storage capacitor 6 on the lithium cell package 4, and energy storage capacitor 6 and solar cell 5 are parallelly connected, and energy storage capacitor still connects the feeder ear at control chip 3.
Specifically, the switch control circuit 2 includes a first driving switch section 21 and a second driving switch section 22.
The first driving switch part 21 comprises resistors R1, R2, R3, a triode Q1 and a mos transistor Q2; one end of a resistor R1 is connected with the control chip 3, the other end of the resistor R1 is connected with the base electrode of the triode Q1, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the grid electrode of the mos tube Q2 and one end of the resistor R3, and the other end of the resistor R3 is connected with the source electrode of the mos tube Q2 and the anode of the charging and discharging interface 1.
The second driving switch part 22 comprises resistors R4, R5, R6, a triode Q3 and a mos transistor Q4; one end of the resistor R4 is connected with the control chip 3, the other end of the resistor R4 is connected with the base electrode of the triode Q3, the emitter electrode of the triode Q3 is grounded, the collector electrode of the triode Q3 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with the grid electrode of the mos tube Q2 and one end of the resistor R6, and the other end of the resistor R6 is connected with the source electrode of the mos tube Q4 and the anode of the lithium battery pack 4. The drain electrode of the mos tube Q2 is connected with the drain electrode of the mos tube Q4.
The mos tube Q2 and the mos tube Q4 are P-channel enhanced mos tubes, and a one-way diode 7 is combined inside the mos tubes. In addition, transistors Q1 and Q2 are npn transistors.
Those skilled in the art should understand that the design core of the present solution is not on the resistance of the resistor, and the parameters of each component, but on the line connection structure between the components.
The working process is as follows:
and (3) charging process: the charge and discharge interface 1 is connected to an external power source through a charger, and at this time, the lithium battery pack 4 still has electric energy to provide electric energy for the control chip 3, or the energy storage capacitor 6 can provide electric energy for the control chip 3, or the solar battery 5 can provide electric energy for the control chip 3, so that the control chip 3 can normally operate, and the control chips 3a1 and a2 reach the first driving switch portion 21 and the second driving switch portion 22. So that the mos tube Q2 is turned on, and at the moment, the current supplies power to the lithium battery pack 4 through the mos tube Q2 and the unidirectional diode 7 on the mos tube Q4. After the lithium battery pack 4 is powered, the energy storage capacitor 6 and the control chip 3 can be powered. The control chip 3 can be a 51-chip microcomputer.
A discharging process; when the control chip 3 is powered on, the signals a1 and a2 are converted, so that the mos tube Q4 is turned on, and at this time, current is output from the lithium battery pack 4 and reaches the charge-discharge interface 1 through the mos tube Q4 and the unidirectional diode 7 on the mos tube Q2 to realize discharge.
Example 2:
based on the structure of the above embodiment 1, those skilled in the art should know that the circuits are all mounted on the PCB, and therefore the switch control circuit 2 is mounted on the PCB 8, and as understood with reference to fig. 2, the PCB 8 is fixedly connected with the thermoelectric generation chip 9, and the thermoelectric generation chip 9 is connected in parallel to the energy storage capacitor 6.
By last knowing, during operation, can utilize the effect of thermoelectric generation piece 9, the difference in temperature between external temperature and pcb board 8 produces voltage and supplies power for energy storage capacitor 6 to, can further keep energy storage capacitor 6's electric quantity.
Of course, the above is only a typical example of the present invention, and besides, the present invention can also have other various specific embodiments, and all technical solutions adopting equivalent replacement or equivalent transformation are all within the scope of the present invention as claimed.
Claims (4)
1. The utility model provides a starting circuit suitable for zero voltage lithium cell, includes charge-discharge interface, on-off control circuit, control chip and lithium cell package, and the anodal connection control chip of lithium cell package is used for providing the power, and control chip passes through on-off control circuit and connects on the power supply main line between charge-discharge interface and lithium cell package, and on-off control circuit controls the break-make of charge-discharge interface and lithium cell package main line, characterized by, be connected with solar cell and energy storage capacitor on the lithium cell package, energy storage capacitor and solar cell are parallelly connected, energy storage capacitor still connects the power supply end at control chip.
2. The starting circuit for the zero-voltage lithium battery as claimed in claim 1, wherein the switching control circuit comprises a first driving switch part and a second driving switch part;
the first driving switch part comprises resistors R1, R2, R3, a triode Q1 and a mos tube Q2; one end of a resistor R1 is connected with the control chip, the other end of the resistor R1 is connected with the base electrode of the triode Q1, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the grid electrode of the mos tube Q2 and one end of the resistor R3, and the other end of the resistor R3 is connected with the source electrode of the mos tube Q2 and the positive electrode of the charge-discharge interface;
the second driving switch part comprises resistors R4, R5, R6, a triode Q3 and a mos tube Q4; one end of a resistor R4 is connected with the control chip, the other end of the resistor R4 is connected with the base electrode of the triode Q3, the emitter electrode of the triode Q3 is grounded, the collector electrode of the triode Q3 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with the grid electrode of the mos tube Q2 and one end of the resistor R6, and the other end of the resistor R6 is connected with the source electrode of the mos tube Q4 and the anode of the lithium battery pack;
the drain electrode of the mos tube Q2 is connected with the drain electrode of the mos tube Q4.
3. The starting circuit for the zero-voltage lithium battery as claimed in claim 2, wherein the mos transistor Q2 and the mos transistor Q4 are P-channel enhancement type mos transistors, and a one-way diode is combined inside the mos transistor Q2 and the mos transistor Q4.
4. The starting circuit for the zero-voltage lithium battery as claimed in claim 1, wherein the switch control circuit is mounted on a pcb board, and a thermoelectric generation piece is fixedly connected to the pcb board and connected to the energy storage capacitor in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921672060.2U CN210838979U (en) | 2019-10-08 | 2019-10-08 | Starting circuit suitable for zero-voltage lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921672060.2U CN210838979U (en) | 2019-10-08 | 2019-10-08 | Starting circuit suitable for zero-voltage lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210838979U true CN210838979U (en) | 2020-06-23 |
Family
ID=71261933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921672060.2U Expired - Fee Related CN210838979U (en) | 2019-10-08 | 2019-10-08 | Starting circuit suitable for zero-voltage lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210838979U (en) |
-
2019
- 2019-10-08 CN CN201921672060.2U patent/CN210838979U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200623 Termination date: 20211008 |